Table 4.

Comparison of root resorption number among the groups and between buccal and lingual surfaces

Group	Buccal	Lingual	Total	p-value‡
Hybrid	1.100 ± 1.200a	1.700 ± 2.110a	2.800 ± 2.250a	0.082
Hyrax	9.700 ± 4.571b	5.600 ± 2.412b	15.300 ± 6.500b	0.023*
Acrylic bonded	11.900 ± 4.890c	8.500 ± 5.300c	20.400 ± 7.545c	0.048*
Full coverage	9.300 ± 1.950b	3.900 ± 3.250ab	13.200 ± 4.420b	0.007**
p-value†	0.0001***	0.003**	0.0001***

Values are presented as mean ± standard deviation.

*p < 0.05, **p < 0.01, ***p < 0.001.

^†Comparisons among appliances: According to the Kruskal–Wallis one-way analysis of variance test and the Mann–Whitney U test (with Bonferroni correction), there is no statistically significant difference between groups with the same letters.

^‡Comparisons between buccal and lingual surfaces: According to the Mann–Whitney U test (with Bonferroni correction).